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2x+5(x-3)=6
2x + 5x - 15= 6
7x = 21
x=3
b)
(x-1)(x+1)=(x-2)^{2} + 4x
x^{2} -1 = x^{2} - 4x + 4 + 4x
0x = 5 sprzeczny
c)
5x-3/3x+7= 9/5
5(5x-3)= 9(3x+7)
25x - 15= 27x + 63
-2x = 78
x= - 39